Re: I can see the benefits.
And how does this differ from today?
I have been coached by people once upon a time and I have coached people too on how to adjust their body language to improve their chances in an interview as well as what not to do.
Here is an example of what not to do. Legs are above chest level when seated and she is holding leg up in hand mid-interview. The only thing that screams "arrogant s/d of a b" more than that is to hold your arms/hands behind your head while talking.
Like it or not looks and body language are important. Though most of it usually not static stuff - you cannot judge stuff like that from a single picture, especially a passport style mugshot. In fact face alone is insufficient - you have to observe the person for a while to pick up things like this.